h2 {
    width: 500px;
    margin: 10px auto;
    text-align: center;
}

ul {
    border: 1px solid;
    min-height: 200px;
    width: 600px;
    margin: 0 auto;
    text-align: center;
    position: relative;
    padding: 0;
}

li {
    font-size: 12px;
    list-style: none;
    display: flex;
    justify-content: space-evenly;
    align-items: center;
    line-height: 20px;
}
li:nth-child(2n+3){
    background-color: #ededed;
}

li>span {
    display: block;
    width: 100px;
    text-align: center;
    margin: 5px 0;
    text-overflow: ellipsis;
    white-space: nowrap;
    overflow: hidden;
}

li:first-of-type {
    font-size: 16px;
    background-color: #dedddd;
    border-bottom: 1px solid;
    box-sizing: border-box;
    line-height: 30px;
}

li:first-of-type>button {
    visibility: hidden;
}

.btn {
    text-align: center;
    margin: 20px;
}

a {
    text-decoration: none;
    color: brown;
}

.logout {
    position: fixed;
    top: 20px;
    right: 40px;
    border: 1px solid black;
    padding: 3px 5px;
    border-radius: 5px;
    color: black;
    text-decoration: underline;
}

iframe {
    display: block;
    position: fixed;
    right: 0;
    bottom: 0;
    margin: auto;
}

.iconfont {
    color: #ccc;
}

@keyframes kuxuan {
    25% {
        filter: drop-shadow(0 0 10px red);
        background-color: red;
    }

    50% {
        filter: drop-shadow(0 0 0 rgb(88, 53, 192));
        background-color: rgb(88, 53, 192);
    }

    75% {
        filter: drop-shadow(0 0 20px rgb(59, 226, 137));
        background-color: rgb(59, 226, 137);
    }
}

.light {
    width: 30px;
    height: 30px;
    background-color: rgb(220, 81, 42);
    border-radius: 50%;
    margin: 40px auto;
    animation: kuxuan 1s infinite !important;
    position: absolute;
    top: -20px;
    right: 130px;
}